Author: Heiner Marxen
Date: 21:53:48 11/09/01
Go up one level in this thread
On November 09, 2001 at 11:03:54, leonid wrote: >On November 09, 2001 at 09:17:31, Paul wrote: > >>On November 09, 2001 at 08:07:10, leonid wrote: >> >>>[D]nqbqrrQ1/k4P2/4N3/1RRNBK2/2Q5/1N4b1/Bqpqpnq1/8 w - - >>> >>>Please indicate your result. >>> >>>Thanks, >>>Leonid. >> >>Hi guys! > >Hi! > >>Mine finds this mate so incredibly fast, that I (almost) don't believe it: >> >>00:03 WM13 09 Bxb8+ Bxb8 Qa4+ Ba6 Rb7+ Kxb7 Nxd8+ Rxd8 Rb5+ Bxb5 Qxb5+ Ka7 Qa4+ >>Qa5 Qxa5+ Kb7 Qb5+ Ka7 Qa4+ Kb7 Nc5+ Kc8 Qa6+ Qb7 Qxb7# > >You found very quickly indeed. Mine took 1.64 sec to find mate in 13 by >selective. > >This mate is mate in 13. I went only 12 moves by brute force to be sure about >its depth. Branching factor is very nice on this position and by brute force it >is not difficult to solve it even 13 moves deep. Ah, yes, you are right. Chest thinks also that this is a mate in 13: PV: Bxb8+ Bxb8 Qa4+ Ba6 Rb7+ Kxb7 Nxd8+ Rxd8 Rb5+ Bxb5 Qxb5+ Ka7 Qa4+ Qa5 Qxa5+ Kb7 Qb5+ Ka7 Qa4+ Kb7 Nc5+ Kc8 Qa6+ Qb7 Qxb7# Uhh... that is exactly Paul's PV, isn't it? It was a relatively easy job, with a very small EBF: 320 seconds on my K7/600: # 1 0.00s 0kN 0.87 1- 0 # 2 0.00s 0kN 1.00 1- 0 # 3 0.00s 1kN [ 9.31] 0.94 54- 0 # 4 0.05s 3kN [ 5.96] 1.04 379- 0 # 5 0.26s [ 5.20] 13kN [ 3.99] 1.23 1673- 0 # 6 0.89s [ 3.42] 40kN [ 3.13] 1.67 6039- 0 # 7 2.57s [ 2.89] 107kN [ 2.67] 2.41 17894- 0 # 8 6.40s [ 2.49] 255kN [ 2.37] 3.47 43831- 0 # 9 14.53s [ 2.27] 571kN [ 2.24] 4.88 97424- 0 # 10 30.51s [ 2.10] 1202kN [ 2.11] 6.71 203223- 0 # 11 63.00s [ 2.06] 2497kN [ 2.08] 8.71 427138- 0 # 12 133.75s [ 2.12] 5422kN [ 2.17] 10.72 950362- 0 # 13 319.28s [ 2.39] 13493kN [ 2.49] 11.95 2466562- 223 >>That's quite a difference with the last one, isn't it! And for Heiner: now I'm >>pretty sure you'll find something shorter ... ;) So much about "pretty sure" ;-} You lost! Or did you win? :-)) Ahh, now I see: Pretz did win ;-) He is much smarter than its author... no, I did not say that <grin>. >>Groetjes from sunny but cold Amsterdam, Weather here around is similar: cold, but mostly sunny (over the day). >Cheers from Montreal where it is better to stay indoor. Windy and cold. > >Leonid. > >>Paul Cheers, Heiner
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